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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lücking R. (95-08-01) and Triebel D. (98-01-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 4. Lasioloma. Ectolechiaceae (Vain.) Zahlbr. (1905); family of unknown placement (incertae sedis); Lecanorales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 62: 1-220 [73-75] (1997); Hafellner H., Beih. Nova Hedwigia 79: 241-371 [287-288] (1984); Lücking R., Lichenologist 31(3): 269-289 (1999); Santesson R., Symb. Bot. Upsal. 12: 1-590 [545-551] (1952); Vezda A., Nova Hedwigia 58(1-2): 123-143 (1994).

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Scytonema (A. Beck 22-05-97); Scytonemataceae; Nostocales, Cyanobacteria, Prokaryota. Secondary photobiont absent or present.

Thallus: Crustose, not subdivided parts. Thallus Outline: Soon disappearing or persistent. Upper Surface: Green, grey, white, or yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate or cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface, soon sessile. Margin: Prominent; external filaments present. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells brownish yellow. Interascal Hyphae: Present, distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Brown.

Asci: Tholus thickened, amyloid, entirely amyloid throughout; dehiscence lecanoralean.

Ascospores: 1–2 to c. 4 per ascus, ellipsoid, curved, or cylindrical, 45-115 µm long, 4-35 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; campylidial; sessile, formed all accross the thallus surface.

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